package v1ch10.image;

import javax.swing.*;
import java.awt.*;

/**
 * @author Cay Horstmann
 * @version 1.34 2015-05-12
 */
public class ImageTest {
	public static void main(String[] args) {
		EventQueue.invokeLater(() ->
		{
			JFrame frame = new ImageFrame();
			frame.setTitle("ImageTest");
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.setVisible(true);
		});
	}
}

/**
 * A frame with an image component
 */
class ImageFrame extends JFrame {
	public ImageFrame() {
		add(new ImageComponent());
		pack();
	}
}

/**
 * A component that displays a tiled image
 */
class ImageComponent extends JComponent {
	private static final int DEFAULT_WIDTH = 300;
	private static final int DEFAULT_HEIGHT = 200;
	
	private Image image;
	
	public ImageComponent() {
		image = new ImageIcon("blue-ball.gif").getImage();
	}
	
	public void paintComponent(Graphics g) {
		if (image == null) return;
		
		int imageWidth = image.getWidth(null);
		int imageHeight = image.getHeight(null);
		
		// draw the image in the upper-left corner
		
		g.drawImage(image, 0, 0, null);
		// tile the image across the component
		
		for (int i = 0; i * imageWidth <= getWidth(); i++)
			for (int j = 0; j * imageHeight <= getHeight(); j++)
				if (i + j > 0)
					g.copyArea(0, 0, imageWidth, imageHeight, i * imageWidth, j * imageHeight);
	}
	
	public Dimension getPreferredSize() {
		return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT);
	}
}
